These systems watch for an inattentive driver and help keep drivers alert. Many Mercedes-Benz vehicles, like the ML350 seen here, have systems like this. Read our full review of the ML350 here. (Mercedes-Benz)

Such a system can detect when a vehicle is at risk for a collision and can warn the driver and prepare the vehicle to minimize injuries. It's available on cars like this Cadillac XTS. Read our full review of the XTS here.

Such a system can detect when a vehicle is at risk for a collision and can warn the driver and prepare the vehicle to minimize injuries. It's available on cars like this Cadillac XTS. Read our full review of the XTS here. (General Motors)